Apparatus for producing sand or other molds.



PATENTED AUG. 2, 1904.

J. W. FRASER.

APPARATUS FOR PRODUCING SAND OR OTHER MOLDS.

APPLIOATION FILED 1330.30, 1903.

3 SHEBTS-SHEET 1.

N0 MODEL.

PATENTED AUG. 2, 1904.

J. W. FRASER.

APPARATUS FOR PRODUCING SAND OR OTHER MOLDS.

APPLIOATION FILED DEG. 30, 1803.

3 SHEETS-SHEET 2.

N0 MODEL.

7 Wflaesses N0. 766,683. PATENTED AUG. 2, 1904. J. W. FRASER. APPARATUS FOR PRODUCING SAND OR OTHER MOLDS.

APPLIUATION FILED DEG. 30, 1903.

N0 MODEL. 3 SHEETS-SHEET 3.

Wflaeases I SIB EDY:

, if Juwwfiw 4 w UNITED STATES Patented August 2, 1904.

JAMES \V. FRASER, OF MILLBURN, SCOTLAND.

APPARATUS FOR PRODUCING SAND OR OTHER IVIOLDS.

SPECIFICATION formingpart of Letters Patent No. 766,683, dated August 2, 1904.

Application filed December 30, 1903.

To all whom it may concern:

Be it known that I, JAMES WV. FRASER, a subject of the King of Great Britain, and a resident of Millburn, Inverness, Scotland, (whose post-oflice address is Dulnan Villa, Millburn, aforesaid) have invented certain new and useful Improvements in Apparatus for Producing Sand or other Molds for Casting Metal Articles, of which the following is a specification.

This invention has for its object an apparatus for producing sand and other molds for casting metal articles that have to be made in large numbers from the same pattern.

In the accompanying drawings, Figure 1 is a side elevation; Fig. 2, a plan; Fig. 3, an end view.

The machine consists ,of a pedestal A, carrying an arm B, pivoted to the pedestal at the point C. At one end of the arm B is carried a frame D and at the other end there is a counterbalancing-weight E, shaped to the radius of the path through which the end of the arm B has to travel. The frame 1) carries a plate F, which is attached to shafts G, journaled in the frame D. The plateF has a machined surface, to which are attached the patterns. On the surface are two square vertical projections H, which correspond and fit into two ears or lugs cast on the moldingbox H so as to hold it in position while the sand is being packed in the box around the patterns. At the two sides of the plate F are hooks J loosely journaled to the shafts G and made to grip or hold the handles J X of the molding-box, so as to bring it tight down on the surface of the plate F. These two hooks are attached to and form part of a frameK, which passes underneath the plate F and is free to turn on the shafts G. In the center of this frame K is a lever L, pivoted thereto, which pulled from the position shown in the drawings into, say, a horizontal position presses the head at its end hard against the under side of the plate F and causes the hooks J to be brought hard down on the handles of the molding-box. At the end of the arm B Serial No. 187,119. (No model.)

where it joins the frame D there is a fork M, to which is joined the bar N. On this latter there is a counterbalance-weight 0, adjustable on the bar N to balance the weight of the patterns, sand, and molding-box according to the size of the article to be cast. This weight is to hold the machine in the position as shown on drawings while the molding is being performed. On the under side of the arm B is a similar fork P, to which is joined the bar Q, on which is a sliding balance-Weight R. This latter is held in position on the bar Q by the pin S, which passes through a hole in the bar Q, and is held there by a spiral spring T.

U is a table on which the molding-box, with patterns and sand complete, is deposited when the arm B is rotated through the arc of a circle.

V is a crank keyed onto the shaft G, and l/V a connecting-rod (in two portions for adjustment purposes) coupled at one end of this crank V and at the other turning on a pivot in the fixed bracket X, which is in turn fixed to a bracket Y. Bracket X is adjustable in bracket Y, and the pivot on which the rod W turns is adjustable in a slot in the bracket X. \Vhen the arm B is rocked one way or the other, the rod \V turns also, but on a different center to arm B, and this imparts a peculiar turning movement to the plate F, which permits the machine to lift the plate F, with patterns attached, from the molding box when the arm B is swung back as nearly as possible in a vertical line, so that the patterns come away without injury to the mold.

The mode of action is as follows: WVhen the sand is packed in the molding-box around the patterns, the spring T is compressed by withdrawing the pin S from the hole in the bar Q, and the weight R slides by gravity along bar Q until pin Sis forced by the spiral spring T into the hole .sfarther down the bar. This motion destroys the equilibrium of the machine and causes the arm B to turn on the axis O, and the molding-box, with pattern and sand complete, is inverted and brought bottom side up onto the table U. Lever Lis now released and the hooks J disengaged, thus disconnecting the plate from the moldingbox H so that the arm with the plate F can swing back and raise the pattern out of the sand mold, leaving the molding-box on the table. The swinging back is effected by releasing the pin S from the hole in the bar Q by again compressing spiral spring T, and then. weight R slides again by gravity down bar Q, causing the arm B to again revolve, but in the opposite direction from before, and bringing the machine back to its original position. A fresh molding box is then placed on the plate F and secured in position by the hooks J ready to start molding again. The pattern attached to the plate F is withdrawn from the mold when deposited on the table U without injury to the sand mold, because by the arrangement of crank V and connecting-rod W the plate F remains horizontal when the arm B begins to turn back in the reverse direction. This insures the pattern being withdrawn from the molding-box as nearly as possible in a vertical line until the pattern is clear of the mold when it begins to followaradial path until it returns to its original position to enable the molding to be started afresh, and thus the patterns come away without injury to the sand mold. When the pattern is thus withdrawn, the mold is removed by hand from the table U to make room for the next molding box which is deposited by the machine. After having the top box put on the mold is ready to be run with metal. The slotted holes in the bracket X and the connecting-rod W adjust the turning movement of the plate F to suit the depth of the pattern which is being molded.

The machine with two men working is capable of turning out twelve tons of fifty-pound chairs per day of ten hours. The best way to Work the machine is to have it in a corner of the foundry with a big floorspace at its disposal to lay out the boxes and complete as fast as the machine deposits them on table U.

I declare that what I claim is 1. An apparatus for the purpose specified, having a frame, a rotative arm mounted in and turning about an axis in said frame, a counterweight carried at one end of said arm, a rock-shaft carried at the other end of said arm, a supporting-plate for the pattern, secured to the said rock-shaft, a crank on said rock-shaft, and a connecting-rod coupled at one end to the crank and at the other end turning on a pivot located eccentrically to the axis about which the carrying arm turns, whereby a special movement is imparted to said supporting-plate when the carrying-arm is rotated.

2. An apparatus for the purpose specified,

he ving a frame, a counterweighted arm which turns about an axis in said frame and has a frame D at one end, a rock-shaft journaled in said frame, a supporting-plate for the pattern, secured to said roclvshaft, a moldingbox with handles mounted on said plate, hooks J, loosely journaled on the rock-shaft and connected below by a bar to form a frame, said hooks being adapted to engage the respective handles on the molding-box, and a cam-lever pivoted to said bar and adapted to press on the under side of said plate for drawing down the hooks J and thus securing the molding-box firmly in place.

3. An apparatus for the purpose specified, having a receiving-table, a frame, a rotating arm pivotally mounted in said frame and carrying at one end a counterweight and at the other end a rock-shaft, a supporting-plate for the pattern secured to said shaft, a moldingbox mounted on said plate over the pattern, said box to receive the sand in which the pattern is embedded, a crank secured to said rock-shaft, and a connecting-rod coupled at one end to said crank and at the other end turning about a pivot situated at a different point from the axis about which the carryingarm turns, in such a manner that when said arm is turned about its axis, the plate and the molding-box, with the pattern and its embedding sand, is inverted and deposited bottom up on the receiving-table, and when the carrying-arm is turned the reverse way, after the moldingbox has been released from the plate, the pattern will be withdrawn from the sand in a vertical line until the pattern is clear of the sand and-will then move in a radial path until it returns to its original position, to enable the molding to be started afresh.

4. An apparatus for producing molds, comprising a rotative arm carrying at one end a counterweight and at the other end a rockshaft supporting a plate to which is attached the pattern to be molded, and on which plate is mounted a molding-box in which the sand is packed around the pattern, in combination with a bar Q attached to said arm, a balanceweight R mounted on this bar Q, and which when slid to one end of said rod will destroy the equilibrium of the arm, so as to cause it to turn on its axis, or when slid to the other end of the rod, will bring the said arm back to its former position, and means for locking said balance-weight in one position or the other.

5. An apparatus for the purpose specified, having a frame, a rotative arm' B pivotally mounted in said frame and carrying at one end a counterweight and at the other end a rock-shaft, a supporting-plate secured to said shaft to receive the pattern and the molding- In Witness whereof I have hereunto signed my name, this 10th day of December, 1903, 10 in the presence of two subscribing-wltnesses.

JAMES WV. FRASER. [L. 8.]

Witnesses:

DAVID LOGAN, RODERICK CAMERON. 

